Flexibility markets to procure system services. CoordiNet project

The article describes the objectives of the CoordiNet project, the proposed coordination schemes and architecture to allow TSOs and DSOs to procure systems services in a coordinated manner, and the platforms being developed in the three demonstrators of the project (Spain, Sweden, Greece).The efficiency and reliability of electricity systems depend, among other aspects, on an efficient collaboration between the different market participants, which require updating the roles of all agents involved. The CoordiNet project, co-funded by the EU, intends to demonstrate how TSOs and DSOs can act in a coordinated manner, to purchase and activate system services, promote the cooperation of all actors and eliminate barriers for the active participation of DERs in the market. The results of the project will help to design scalable tools and methodologies for system operators and third parties to safely connect, manage and coordinate flexibility providers. This paper describes the developments in CoordiNet to ensure the interoperability of the different markets and platforms developed by TSOs and DSOs across Europe.European Commissions' H2020 under grant agreement No 824414

TSO-DSO-Customer coordination for purchasing flexibility system services: Challenges and lessons learned from a demonstration in Sweden

This paper presents a real-word implementation of a TSO-DSO-customer coordination framework for the use of flexibility to support system operation. First, we describe the general requirements for TSO-DSO-customer coordination, including potential coordination schemes, actors and roles and the required architecture. Then, we particularise those general requirements for a real-world demonstration in Sweden, aiming to avoid congestions in the grid during the high-demand winter season. In the light of current congestion management rules and existing markets in Sweden, we describe an integration path to newly defined flexibility markets in support of new tools that we developed for this application. The results show that the use of flexibility can reduce the congestion costs while enhancing the secure operation of the system. Additionally, we discuss challenges and lessons learned from the demonstration, including the importance of the engagement between stakeholders, the role of availability remuneration, and the paramount importance of defining appropriate technical requirements and market timings.This work has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement nº 824414

Övertonshalten i lågspänningsnätet : En studie i elkvalitet

All electrical loads need a power grid that delivers electricity with good quality. Current harmonics are a measure of how the electrical loads affect the power quality. Voltage harmonics are a measure on how the electrical loads are affected by the power quality and depend on both the power grid's strength and the current harmonics.This study examines and maps the harmonic voltages and currents in the low voltage grid by analysing 61 measurements which were done in Vattenfall’s electricity distribution grid during 2013. The study compiles guidelines and recommended levels for voltage harmonics in the low voltage grid from government agencies (Energimarknadsinspektionen), industry associations (CENELEC, Svensk Energi), companies (STRI) and Vattenfall’s planning levels and levels for good power quality . The study covers the guidelines and the recommended levels for current harmonics from government agencies (Elsäkerhetsverket), American and German engineering practices and from power grid companies (EON, Fortum and Öresundskraft). How the harmonic content in the 61 measurements relates to different values of voltage and current is also studied.The study suggests that there is reason to set requirements for the harmonics emission in customer agreements. The customers' current harmonics can be used in power quality analysis and in dialogue with customers. The trend among the recommended levels is that emission limit for current harmonics is based on the subscription's size alternatively maximum electrical load but also on network strength.The measurements indicate that the relationship between network strength and voltage harmonics is affected by the current harmonics such that a reduction of network strength does not increase the harmonic content of the voltage, which would have been expected. The relationship can be explained when voltage harmonics from a higher voltage levels dominate the voltage distortion in the low-voltage grid.The study indicates that the limits for voltage harmonics 15 and 21 are too low and should be revised. A method in question which is gaining attention is if it should be investigated further if it is more appropriate to use the 99 percentile values instead of 100 percentile in regulation 2013:1.Validerat; 20151016 (global_studentproject_submitter

Mapping of harmonic levels in the low-voltage network

Godkänd; 2015; 20150625 (matbol

Initial experience from the first CoordiNet demonstration

The CoordiNet project within Horizon 2020 programme aims to demonstrate how distribution system operators and transmission system operators can act in a coordinated manner to procure and activate grid services in the most cost-effective and reliable way. This is done through the implementation of three large-scale demonstrations in Sweden, Greece and Spain. The first market to be set into operation was within the Swedish demo in the winter of 2019/2020. The outcome of the flexibility market during the first winter with congestion management day-ahead is described in this study. The results from implementation of the platform, user interface, learnings on stakeholder interaction and initial evaluation of key performance indicators are described